Hi chad1987, welcome to the forum
You shouldn't use system restore when you don't have to, that is asking for trouble
Let's see what we can do :
Download and use the Avast! Uninstall Utility using this tutorial :
http://www.avast.com/uninstall-utilityDownload a fresh copy of Avast 5 Pro from here :
http://files.avast.com/iavs5x/setup_av_pro_eng.exeand install it.
Than in Avast! 5 go to Maintenance -Subscription and click the " Request conversion to v5 licence file " button that should open this link :
http://www.avast.com/resend-license.php( If not you can use this link instead )
Fill in the form with the SAME email address you used when you bought your Avast Pro and you licence key, and a licence file will be send to you.
In Avast! 5 go to Maintenance - Subscription and click the " Insert licence file " button to browse for the licence file and execute it.
Let me know if it helps you
Greetz, Red.